#include <asm/tlbflush.h>
-rwlock_t vmlist_lock = RW_LOCK_UNLOCKED;
+DEFINE_RWLOCK(vmlist_lock);
struct vm_struct *vmlist;
-static void unmap_area_pte(pmd_t *pmd, unsigned long address,
- unsigned long size)
+static void vunmap_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end)
{
- unsigned long end;
pte_t *pte;
- if (pmd_none(*pmd))
- return;
- if (pmd_bad(*pmd)) {
- pmd_ERROR(*pmd);
- pmd_clear(pmd);
- return;
- }
-
- pte = pte_offset_kernel(pmd, address);
- address &= ~PMD_MASK;
- end = address + size;
- if (end > PMD_SIZE)
- end = PMD_SIZE;
-
+ pte = pte_offset_kernel(pmd, addr);
do {
- pte_t page;
- page = ptep_get_and_clear(pte);
- address += PAGE_SIZE;
- pte++;
- if (pte_none(page))
- continue;
- if (pte_present(page))
- continue;
- printk(KERN_CRIT "Whee.. Swapped out page in kernel page table\n");
- } while (address < end);
+ pte_t ptent = ptep_get_and_clear(&init_mm, addr, pte);
+ WARN_ON(!pte_none(ptent) && !pte_present(ptent));
+ } while (pte++, addr += PAGE_SIZE, addr != end);
}
-static void unmap_area_pmd(pgd_t *dir, unsigned long address,
- unsigned long size)
+static inline void vunmap_pmd_range(pud_t *pud, unsigned long addr,
+ unsigned long end)
{
- unsigned long end;
pmd_t *pmd;
+ unsigned long next;
- if (pgd_none(*dir))
- return;
- if (pgd_bad(*dir)) {
- pgd_ERROR(*dir);
- pgd_clear(dir);
- return;
- }
+ pmd = pmd_offset(pud, addr);
+ do {
+ next = pmd_addr_end(addr, end);
+ if (pmd_none_or_clear_bad(pmd))
+ continue;
+ vunmap_pte_range(pmd, addr, next);
+ } while (pmd++, addr = next, addr != end);
+}
- pmd = pmd_offset(dir, address);
- address &= ~PGDIR_MASK;
- end = address + size;
- if (end > PGDIR_SIZE)
- end = PGDIR_SIZE;
+static inline void vunmap_pud_range(pgd_t *pgd, unsigned long addr,
+ unsigned long end)
+{
+ pud_t *pud;
+ unsigned long next;
+ pud = pud_offset(pgd, addr);
do {
- unmap_area_pte(pmd, address, end - address);
- address = (address + PMD_SIZE) & PMD_MASK;
- pmd++;
- } while (address < end);
+ next = pud_addr_end(addr, end);
+ if (pud_none_or_clear_bad(pud))
+ continue;
+ vunmap_pmd_range(pud, addr, next);
+ } while (pud++, addr = next, addr != end);
}
-static int map_area_pte(pte_t *pte, unsigned long address,
- unsigned long size, pgprot_t prot,
- struct page ***pages)
+void unmap_vm_area(struct vm_struct *area)
{
- unsigned long end;
+ pgd_t *pgd;
+ unsigned long next;
+ unsigned long addr = (unsigned long) area->addr;
+ unsigned long end = addr + area->size;
+
+ BUG_ON(addr >= end);
+ pgd = pgd_offset_k(addr);
+ flush_cache_vunmap(addr, end);
+ do {
+ next = pgd_addr_end(addr, end);
+ if (pgd_none_or_clear_bad(pgd))
+ continue;
+ vunmap_pud_range(pgd, addr, next);
+ } while (pgd++, addr = next, addr != end);
+ flush_tlb_kernel_range((unsigned long) area->addr, end);
+}
- address &= ~PMD_MASK;
- end = address + size;
- if (end > PMD_SIZE)
- end = PMD_SIZE;
+static int vmap_pte_range(pmd_t *pmd, unsigned long addr,
+ unsigned long end, pgprot_t prot, struct page ***pages)
+{
+ pte_t *pte;
+ pte = pte_alloc_kernel(&init_mm, pmd, addr);
+ if (!pte)
+ return -ENOMEM;
do {
struct page *page = **pages;
-
WARN_ON(!pte_none(*pte));
if (!page)
return -ENOMEM;
-
- set_pte(pte, mk_pte(page, prot));
- address += PAGE_SIZE;
- pte++;
+ set_pte_at(&init_mm, addr, pte, mk_pte(page, prot));
(*pages)++;
- } while (address < end);
+ } while (pte++, addr += PAGE_SIZE, addr != end);
return 0;
}
-static int map_area_pmd(pmd_t *pmd, unsigned long address,
- unsigned long size, pgprot_t prot,
- struct page ***pages)
+static inline int vmap_pmd_range(pud_t *pud, unsigned long addr,
+ unsigned long end, pgprot_t prot, struct page ***pages)
{
- unsigned long base, end;
-
- base = address & PGDIR_MASK;
- address &= ~PGDIR_MASK;
- end = address + size;
- if (end > PGDIR_SIZE)
- end = PGDIR_SIZE;
+ pmd_t *pmd;
+ unsigned long next;
+ pmd = pmd_alloc(&init_mm, pud, addr);
+ if (!pmd)
+ return -ENOMEM;
do {
- pte_t * pte = pte_alloc_kernel(&init_mm, pmd, base + address);
- if (!pte)
- return -ENOMEM;
- if (map_area_pte(pte, address, end - address, prot, pages))
+ next = pmd_addr_end(addr, end);
+ if (vmap_pte_range(pmd, addr, next, prot, pages))
return -ENOMEM;
- address = (address + PMD_SIZE) & PMD_MASK;
- pmd++;
- } while (address < end);
-
+ } while (pmd++, addr = next, addr != end);
return 0;
}
-void unmap_vm_area(struct vm_struct *area)
+static inline int vmap_pud_range(pgd_t *pgd, unsigned long addr,
+ unsigned long end, pgprot_t prot, struct page ***pages)
{
- unsigned long address = (unsigned long) area->addr;
- unsigned long end = (address + area->size);
- pgd_t *dir;
+ pud_t *pud;
+ unsigned long next;
- dir = pgd_offset_k(address);
- flush_cache_vunmap(address, end);
+ pud = pud_alloc(&init_mm, pgd, addr);
+ if (!pud)
+ return -ENOMEM;
do {
- unmap_area_pmd(dir, address, end - address);
- address = (address + PGDIR_SIZE) & PGDIR_MASK;
- dir++;
- } while (address && (address < end));
- flush_tlb_kernel_range((unsigned long) area->addr, end);
+ next = pud_addr_end(addr, end);
+ if (vmap_pmd_range(pud, addr, next, prot, pages))
+ return -ENOMEM;
+ } while (pud++, addr = next, addr != end);
+ return 0;
}
int map_vm_area(struct vm_struct *area, pgprot_t prot, struct page ***pages)
{
- unsigned long address = (unsigned long) area->addr;
- unsigned long end = address + (area->size-PAGE_SIZE);
- pgd_t *dir;
- int err = 0;
-
- dir = pgd_offset_k(address);
+ pgd_t *pgd;
+ unsigned long next;
+ unsigned long addr = (unsigned long) area->addr;
+ unsigned long end = addr + area->size - PAGE_SIZE;
+ int err;
+
+ BUG_ON(addr >= end);
+ pgd = pgd_offset_k(addr);
spin_lock(&init_mm.page_table_lock);
do {
- pmd_t *pmd = pmd_alloc(&init_mm, dir, address);
- if (!pmd) {
- err = -ENOMEM;
- break;
- }
- if (map_area_pmd(pmd, address, end - address, prot, pages)) {
- err = -ENOMEM;
+ next = pgd_addr_end(addr, end);
+ err = vmap_pud_range(pgd, addr, next, prot, pages);
+ if (err)
break;
- }
-
- address = (address + PGDIR_SIZE) & PGDIR_MASK;
- dir++;
- } while (address && (address < end));
-
+ } while (pgd++, addr = next, addr != end);
spin_unlock(&init_mm.page_table_lock);
flush_cache_vmap((unsigned long) area->addr, end);
return err;
}
+#define IOREMAP_MAX_ORDER (7 + PAGE_SHIFT) /* 128 pages */
+
struct vm_struct *__get_vm_area(unsigned long size, unsigned long flags,
unsigned long start, unsigned long end)
{
struct vm_struct **p, *tmp, *area;
- unsigned long addr = start;
+ unsigned long align = 1;
+ unsigned long addr;
+
+ if (flags & VM_IOREMAP) {
+ int bit = fls(size);
+
+ if (bit > IOREMAP_MAX_ORDER)
+ bit = IOREMAP_MAX_ORDER;
+ else if (bit < PAGE_SHIFT)
+ bit = PAGE_SHIFT;
+
+ align = 1ul << bit;
+ }
+ addr = ALIGN(start, align);
+ size = PAGE_ALIGN(size);
area = kmalloc(sizeof(*area), GFP_KERNEL);
if (unlikely(!area))
return NULL;
- /*
- * We always allocate a guard page.
- */
- size += PAGE_SIZE;
if (unlikely(!size)) {
kfree (area);
return NULL;
}
+ /*
+ * We always allocate a guard page.
+ */
+ size += PAGE_SIZE;
+
write_lock(&vmlist_lock);
for (p = &vmlist; (tmp = *p) != NULL ;p = &tmp->next) {
- if ((unsigned long)tmp->addr < addr)
+ if ((unsigned long)tmp->addr < addr) {
+ if((unsigned long)tmp->addr + tmp->size >= addr)
+ addr = ALIGN(tmp->size +
+ (unsigned long)tmp->addr, align);
continue;
+ }
if ((size + addr) < addr)
goto out;
if (size + addr <= (unsigned long)tmp->addr)
goto found;
- addr = tmp->size + (unsigned long)tmp->addr;
+ addr = ALIGN(tmp->size + (unsigned long)tmp->addr, align);
if (addr > end - size)
goto out;
}
out:
write_unlock(&vmlist_lock);
kfree(area);
+ if (printk_ratelimit())
+ printk(KERN_WARNING "allocation failed: out of vmalloc space - use vmalloc=<size> to increase size.\n");
return NULL;
}
return __get_vm_area(size, flags, VMALLOC_START, VMALLOC_END);
}
-/**
- * remove_vm_area - find and remove a contingous kernel virtual area
- *
- * @addr: base address
- *
- * Search for the kernel VM area starting at @addr, and remove it.
- * This function returns the found VM area, but using it is NOT safe
- * on SMP machines.
- */
-struct vm_struct *remove_vm_area(void *addr)
+/* Caller must hold vmlist_lock */
+struct vm_struct *__remove_vm_area(void *addr)
{
struct vm_struct **p, *tmp;
- write_lock(&vmlist_lock);
for (p = &vmlist ; (tmp = *p) != NULL ;p = &tmp->next) {
if (tmp->addr == addr)
goto found;
}
- write_unlock(&vmlist_lock);
return NULL;
found:
unmap_vm_area(tmp);
*p = tmp->next;
- write_unlock(&vmlist_lock);
+
+ /*
+ * Remove the guard page.
+ */
+ tmp->size -= PAGE_SIZE;
return tmp;
}
+/**
+ * remove_vm_area - find and remove a contingous kernel virtual area
+ *
+ * @addr: base address
+ *
+ * Search for the kernel VM area starting at @addr, and remove it.
+ * This function returns the found VM area, but using it is NOT safe
+ * on SMP machines, except for its size or flags.
+ */
+struct vm_struct *remove_vm_area(void *addr)
+{
+ struct vm_struct *v;
+ write_lock(&vmlist_lock);
+ v = __remove_vm_area(addr);
+ write_unlock(&vmlist_lock);
+ return v;
+}
+
void __vunmap(void *addr, int deallocate_pages)
{
struct vm_struct *area;
WARN_ON(1);
return;
}
-
+
if (deallocate_pages) {
int i;
__free_page(area->pages[i]);
}
- kfree(area->pages);
+ if (area->nr_pages > PAGE_SIZE/sizeof(struct page *))
+ vfree(area->pages);
+ else
+ kfree(area->pages);
}
kfree(area);
EXPORT_SYMBOL(vmap);
-/**
- * __vmalloc - allocate virtually contiguous memory
- *
- * @size: allocation size
- * @gfp_mask: flags for the page level allocator
- * @prot: protection mask for the allocated pages
- *
- * Allocate enough pages to cover @size from the page level
- * allocator with @gfp_mask flags. Map them into contiguous
- * kernel virtual space, using a pagetable protection of @prot.
- */
-void *__vmalloc(unsigned long size, int gfp_mask, pgprot_t prot)
+void *__vmalloc_area(struct vm_struct *area, unsigned int __nocast gfp_mask, pgprot_t prot)
{
- struct vm_struct *area;
struct page **pages;
unsigned int nr_pages, array_size, i;
- size = PAGE_ALIGN(size);
- if (!size || (size >> PAGE_SHIFT) > num_physpages)
- return NULL;
-
- area = get_vm_area(size, VM_ALLOC);
- if (!area)
- return NULL;
-
- nr_pages = size >> PAGE_SHIFT;
+ nr_pages = (area->size - PAGE_SIZE) >> PAGE_SHIFT;
array_size = (nr_pages * sizeof(struct page *));
area->nr_pages = nr_pages;
- area->pages = pages = kmalloc(array_size, (gfp_mask & ~__GFP_HIGHMEM));
+ /* Please note that the recursion is strictly bounded. */
+ if (array_size > PAGE_SIZE)
+ pages = __vmalloc(array_size, gfp_mask, PAGE_KERNEL);
+ else
+ pages = kmalloc(array_size, (gfp_mask & ~__GFP_HIGHMEM));
+ area->pages = pages;
if (!area->pages) {
remove_vm_area(area->addr);
kfree(area);
goto fail;
}
}
-
+
if (map_vm_area(area, prot, &pages))
goto fail;
return area->addr;
return NULL;
}
+/**
+ * __vmalloc - allocate virtually contiguous memory
+ *
+ * @size: allocation size
+ * @gfp_mask: flags for the page level allocator
+ * @prot: protection mask for the allocated pages
+ *
+ * Allocate enough pages to cover @size from the page level
+ * allocator with @gfp_mask flags. Map them into contiguous
+ * kernel virtual space, using a pagetable protection of @prot.
+ */
+void *__vmalloc(unsigned long size, unsigned int __nocast gfp_mask, pgprot_t prot)
+{
+ struct vm_struct *area;
+
+ size = PAGE_ALIGN(size);
+ if (!size || (size >> PAGE_SHIFT) > num_physpages)
+ return NULL;
+
+ area = get_vm_area(size, VM_ALLOC);
+ if (!area)
+ return NULL;
+
+ return __vmalloc_area(area, gfp_mask, prot);
+}
+
EXPORT_SYMBOL(__vmalloc);
/**
EXPORT_SYMBOL(vmalloc);
+#ifndef PAGE_KERNEL_EXEC
+# define PAGE_KERNEL_EXEC PAGE_KERNEL
+#endif
+
/**
* vmalloc_exec - allocate virtually contiguous, executable memory
*
* use __vmalloc() instead.
*/
-#ifndef PAGE_KERNEL_EXEC
-# define PAGE_KERNEL_EXEC PAGE_KERNEL
-#endif
-
void *vmalloc_exec(unsigned long size)
{
return __vmalloc(size, GFP_KERNEL | __GFP_HIGHMEM, PAGE_KERNEL_EXEC);
git://git.onelab.eu / linux-2.6.git / blobdiff